Attila Nagy

The fact that humans can build big, complicated machines is commonplace. But the fact that we can build these massive machines and then move them, sometimes across the planet? That's not so common.

While most machines can be assembled and disassembled in situ, every so often there's a huge part of a mechanism—or sometimes the whole machine—that must be transported in one piece on road. Behold the following heaviest haulage cargos that ever blocked the roads.

In 1988, the two Heat Transfer Reactor Experiment (HTRE) reactors of the Idaho National Laboratory were hauled to the visitor center at the site of Experimental Breeder Reactor I.

2013: This massive electromagnet, the Muon g-2 storage ring, arrived after a cross-country journey from Brookhaven National Laboratory to Fermilab.

An SR-71 Blackbird in transport between Burbank and Palmdale in the mid-1960s.

The space shuttle Endeavor is on its 12-mile journey from Los Angeles International Airport (LAX) to the California Science Center, on October 12, 2012 in Inglewood, California.

Photo: Kevork Djansezian/Getty Images

The fuselage of a decommissioned B-1 bomber is trucked westward on Interstate 70 near Greenfield, Indiana on October 18, 2003. The disassembled bomber, once displayed at the Wright Patterson Air Force Base in Dayton, Ohio, was escorted by Indiana State Police and headed for the Strategic Air and Space Museum in Ashland, Nebraska.

Photo: Tom Strickland/AP

2011: A flatbed truck carries the fuselage of US Airways flight 1549, the plane that made a miraculous landing on the Hudson River on January 15, 2009, to the Carolinas Aviation Museum in Charlotte, North Carolina.

Photo: Chuck Burton/AP

26th November 1951: The first British-made aluminum alloy barge, being taken by road from Dagenham to Avonmouth, to be shipped to Rio de Janeiro for use as a coal depot.

Photo: Fox Photos/Getty Images

Circa 1949: A Hackbridge transformer on its way from Surrey to the Victoria Docks, for shipment to Canada.

Photo: Topical Press Agency/Getty Images

1930: "The world's largest lorry" carrying a boiler.

Photo: Fox Photos/Getty Images

Escorted by Massachusetts State Police, trucks tow and push the flatbed truck carrying a reactor vessel, encased in concrete, from the shutdown Yankee Rowe Nuclear Power Station in Florida, Mass., Sunday, April 27, 1997.

Photo: Alan Solomon/AP

A replica of the Orion Multi-Purpose Crew Vehicle (Orion MPCV) is transported to the inaugural parade, on Jan. 20, 2013, in Washington D.C.

A wind turbine blade on the back of a flatbed trailer near Brighton, Colorado, March 25, 2009.

Photo: David Zalubowski/AP

Dr. Charles Springer, Director of the Advanced Imaging Research Center at Oregon Health and Sciences University, watches as the third and largest MRI magnet is transported on a specially built flatbed trailer to the hospital in Portland, Oregon, Saturday, Jan. 21, 2006.

Photo: Greg Wahl-Stephens/AP

Heavy tunnel digging machinery—loaded on a flatbed trailer—is carried to the construction site of Stuttgart 21, on December 12, 2013 in Ostfildern-Scharnhausen.